Second pair on river

I sat at the table about 10 hands before and started playing my aggressive short handed game, in position. I had just raised 5x OTB after 2 limpers and took the pot down after one caller on the flop.

I checked the flop because I had been pretty aggressive and I didnt want them to CR me because then I would have to give up my hand. NOTE: he bet both turn and river really fast. In general the table had been really loose/weak.

biochemist is at seat 1 with 51.90
cmoney13 is at seat 2 with 367.77
AGOOD is at seat 3 with 285.20
bigq is at seat 4 with 98.95
Saalis is at seat 5 with 221.75

AGOOD posts the large blind 2.00
cmoney13 posts the small blind 1.00

cmoney13: --, --
AGOOD: --, --
bigq: --, --
Saalis: 9h, Kc
biochemist: --, --

Pre-flop:

bigq: Fold
Saalis: Raise 6.00
biochemist: Fold
cmoney13: Call 6.00
AGOOD: Fold

Flop (Board: Qd, 7s, 9s):

cmoney13: Check
Saalis: Check

Turn (Board: Qd, 7s, 9s, 3h):

cmoney13: Bet 12.00
Saalis: Call 12.00

River (Board: Qd, 7s, 9s, 3h, 7d):

cmoney13: Bet 28.00
Saalis: ??????

results in white below


Saalis: Call 28.00

Showdown:

cmoney13 shows: 8d, 2c (a pair of Sevens)
Saalis shows: 9h, Kc (two pair, Nines and Sevens)

Mainpot:
Saalis wins the pot of 91.00 with two pair, Nines and Sevens

From the way the hand went I would have either put him on a weak queen (he called your PFR with 82o, so a weak queen like Q5 or something doesn't seem to be too much of a stretch) and try to push him off, or junk (which he actually had)

gh